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Reverse SnapMirror relationships between ONTAP FlexGroup volumes during disaster recovery

Contributors netapp-aaron-holt netapp-barbe netapp-aherbin
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When a disaster disables the source FlexGroup volume of a SnapMirror relationship, you can use the destination FlexGroup volume to serve data while you repair or replace the source FlexGroup volume. After the source FlexGroup volume is online, you can make the original source FlexGroup volume a read-only destination and reverse the SnapMirror relationship.

About this task

Any active quota rules on the destination volume are deactivated and the quota rules are deleted before resynchronization is performed.

You can use the volume quota policy rule create and volume quota modify commands to create and reactivate quota rules after the resynchronization operation is complete.

Steps

  1. On the original destination FlexGroup volume, remove the data protection mirror relationship between the source FlexGroup volume and the destination FlexGroup volume: snapmirror delete -destination-path svm_name:volume_name

    cluster2::> snapmirror delete -destination-path vsd:dst

  2. On the original source FlexGroup volume, remove the relationship information from the source FlexGroup volume: snapmirror release -destination-path svm_name:volume_name -relationship-info-only

    After deleting a SnapMirror relationship, you must remove the relationship information from the source FlexGroup volume before attempting a resynchronization operation.

    cluster1::> snapmirror release -destination-path vsd:dst -relationship-info-only true

  3. On the new destination FlexGroup volume, create the mirror relationship: snapmirror create -source-path src_svm_name:volume_name -destination-path dst_svm_name:volume_name -type XDP -policy MirrorAllSnapshots

    cluster1::> snapmirror create -source-path vsd:dst -destination-path vss:src -type XDP -policy MirrorAllSnapshots

    Learn more about snapmirror create in the ONTAP command reference.

  4. On the new destination FlexGroup volume, resynchronize the source FlexGroup: snapmirror resync -source-path svm_name:volume_name

    cluster1::> snapmirror resync -source-path vsd:dst

  5. Monitor the SnapMirror transfers: snapmirror show -expand

    cluster2::> snapmirror show -expand
                                                                       Progress
Source            Destination Mirror  Relationship   Total             Last
Path        Type  Path        State   Status         Progress  Healthy Updated
----------- ---- ------------ ------- -------------- --------- ------- --------
vsd:dst       XDP  vss:src        Snapmirrored
                                      Idle           -         true    -
vss:dst__0001 XDP  vss:src__0001  Snapmirrored
                                      Idle           -         true    -
vsd:dst__0002 XDP  vss:src__0002  Snapmirrored
                                      Idle           -         true    -
vsd:dst__0003 XDP  vss:src__0003  Snapmirrored
                                      Idle           -         true    -
vsd:dst__0004 XDP  vss:src__0004  Snapmirrored
                                      Idle           -         true    -
vsd:dst__0005 XDP  vss:src__0005  Snapmirrored
                                      Idle           -         true    -
vsd:dst__0006 XDP  vss:src__0006  Snapmirrored
                                      Idle           -         true    -
vsd:dst__0007 XDP  vss:src__0007  Snapmirrored
                                      Idle           -         true    -
vsd:dst__0008 XDP  vss:src__0008  Snapmirrored
                                      Idle           -         true    -
...

    The SnapMirror relationship status of each constituent shows as Snapmirrored that indicates that the resynchronization was successful.

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